CALINE3 - 9/13/11 Aerosol & Particulate...

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Unformatted text preview: 9/13/11 Aerosol & Particulate Research Lab CALINE3 CA lifornia LINE source model: A line source Gaussian diffusion based air quality model employing a mixing zone concept . Version 3 available at EPA Support Center for Regulatory Air Models - http:// www.epa.gov/ttn/scram/dispersion_prefrec.htm 9/13/11 11 Aerosol & Particulate Research Lab 9/13/11 Aerosol & Particulate Research Lab Basic Framework: Finite Length Line Source (FLLS) 9/13/11 Aerosol & Particulate Research Lab 22 9/13/11 Aerosol & Particulate Research Lab Highway Elements CALINES3 divides highway into a series of elements; incremental concentration are computed and then summed 1st element: a square with sides equal to highway width Subsequent elements: 9/13/11 Aerosol & Particulate Research Lab 33 EL: Element length W: Highway width NE: Element number GF: Element growth factor : angle between wind direction and roadway < 20o GF = 1.1 20o < < 50o GF = 1.5 50o < < 70o GF = 2.0 > 70o GF = 4.0 Q: Are all elements equal? 9/13/11 Aerosol & Particulate Research Lab 9/13/11 Aerosol & Particulate Research Lab 44 W EL Q: Why does element length become larger with distance from the receptor increases? Wind direction 9/13/11 Aerosol & Particulate Research Lab Equivalent Finite Line Source 9/13/11 Aerosol & Particulate Research Lab 55 Positioned normal to the wind direction and centered at the element midpoint Emissions assumed to be released along the EFLS Each element is divided into 5 discrete sub- elements; emission rate/ area assumed to be uniform throughout the element 9/13/11 Aerosol & Particulate Research Lab Mixing Zone 9/13/11 Aerosol & Particulate Research Lab 66 The region directly over the highway as a zone of uniform emissions and turbulence 9/13/11 Aerosol & Particulate Research Lab Mixing Zone The region over the traveled way (traffic lanes, excluding shoulders) + 3 m on either side Mechanical turbulence created by moving vehicles and thermal turbulence created by hot vehicle exhaust assumed to predominate near the ground Initial vertical dispersion , 9 z0 , is insensitive to traffic volume between 4000-800 vehicles/hr and...
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CALINE3 - 9/13/11 Aerosol & Particulate...

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